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UNITED STATES ROBERT M. OAFFALL, OF ST. LOUIS,

PATENT OFFICE.

MISSOURI, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO THEODORE HUNT, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 230,919, dated August 10, 1880.

Application filed December 8, 1879. v f

To all whom it may concern:

Be it known that 1, ROBERT M. CAFFALL. of St. Louis, Missouri, have invented a new and useful Improvement in Compounds for Waterproofing and Preserving Building Materials, of which the following is a full, clear, and exact description.

The compound in question is for waterproofing, indurating, and preserving stone, brick,

1o wood, stucco, paper, cement, and other building materials without at the same time changing the appearance of the material to which the compound is applied.

The components of the compound are paraffine, creosote, and turpentine. The creosote must be pure and the turpentine and pal-affine the ordinary articles of commerce.

The invention has special relation to the mode of combining the components, and that they may be chemically united.

The compound is prepared as follows; Take one pound of creosote and five pounds of turpentine and boil them together until the mixture becomes thoroughly clear, this part of the 2 5' operation requiring about twenty minutes. Then add twenty-five pounds of par-affine, and heat the combined elements until all of them are in a fluid state, and preferably until the mixture reaches its boiling-point. The effect 0 is to thoroughly combine the creosote and paraifine, and which will not be the case when the creosote and turpentine are combined in proportions different from those above named, or if the preliminary boiling of the creosote and turpentine, as above described, is omitted. 5

The compound is applied in a liquid state, and preferably by paintingit with an ordinary brush onto the surface or material it is desired to treat. The surface or material is also heated to a degree sufficientto liquefy the compound, and preferably hotter. This may be done by holding a cage having a tire therein near or against the surface or material. The tire heats itto the desired degree, and while thus heated the compound is applied. The compound can 5 be driven still farther in and the process more thoroughly applied by holding the fire again to the surface or material, and so on, until the compound is absorbed to any desired depth.

In place of the cage a blow-pipe having a se ries of gas-jets may be used.

I claim- The herein-described compound for waterproofing and preserving building materials, which consists of paratfine, creosote, and llll'- pentine combined in the proportions substantially as described.

ROBERT MAY OAFFALL.

Witnesses CHAS. D. MOODY, PAUL BAKEWELL. 

